32
33
#define _LARGEFILE_SOURCE
33
34
#define _FILE_OFFSET_BITS 64
39
#include <net/if.h> /* if_nametoindex */
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
40
#include <stdint.h> /* uint16_t, uint32_t */
41
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
#include <stdbool.h> /* bool, true */
45
#include <string.h> /* memset(), strcmp(), strlen(),
46
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(), DIR */
52
#include <sys/stat.h> /* open() */
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
struct in6_addr, inet_pton(),
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
59
#include <assert.h> /* assert() */
60
#include <errno.h> /* perror(), errno */
61
#include <time.h> /* time() */
62
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
63
SIOCSIFFLAGS, if_indextoname(),
64
if_nametoindex(), IF_NAMESIZE */
65
#include <netinet/in.h>
66
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
67
getuid(), getgid(), setuid(),
69
#include <arpa/inet.h> /* inet_pton(), htons */
70
#include <iso646.h> /* not, and */
71
#include <argp.h> /* struct argp_option, error_t, struct
72
argp_state, struct argp,
73
argp_parse(), ARGP_KEY_ARG,
74
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
77
/* All Avahi types, constants and functions
41
80
#include <avahi-core/core.h>
42
81
#include <avahi-core/lookup.h>
43
82
#include <avahi-core/log.h>
45
84
#include <avahi-common/malloc.h>
46
85
#include <avahi-common/error.h>
49
#include <sys/types.h> /* socket(), inet_pton() */
50
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
51
struct in6_addr, inet_pton() */
52
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
53
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
55
#include <unistd.h> /* close() */
56
#include <netinet/in.h>
57
#include <stdbool.h> /* true */
58
#include <string.h> /* memset */
59
#include <arpa/inet.h> /* inet_pton() */
60
#include <iso646.h> /* not */
63
#include <errno.h> /* perror() */
88
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
91
init_gnutls_session(),
93
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
94
GNUTLS_OPENPGP_FMT_BASE64 */
97
#include <gpgme.h> /* All GPGME types, constants and
100
GPGME_PROTOCOL_OpenPGP,
69
103
#define BUFFER_SIZE 256
72
static const char *certdir = "/conf/conf.d/mandos";
73
static const char *certfile = "openpgp-client.txt";
74
static const char *certkey = "openpgp-client-key.txt";
105
#define PATHDIR "/conf/conf.d/mandos"
106
#define SECKEY "seckey.txt"
107
#define PUBKEY "pubkey.txt"
76
109
bool debug = false;
110
static const char mandos_protocol_version[] = "1";
111
const char *argp_program_version = "mandos-client " VERSION;
112
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
114
/* Used for passing in values through the Avahi callback functions */
79
gnutls_session_t session;
116
AvahiSimplePoll *simple_poll;
80
118
gnutls_certificate_credentials_t cred;
119
unsigned int dh_bits;
81
120
gnutls_dh_params_t dh_params;
85
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
gpgme_data_t dh_crypto, dh_plain;
121
const char *priority;
126
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
127
* "buffer_capacity" is how much is currently allocated,
128
* "buffer_length" is how much is already used.
130
size_t adjustbuffer(char **buffer, size_t buffer_length,
131
size_t buffer_capacity){
132
if (buffer_length + BUFFER_SIZE > buffer_capacity){
133
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
buffer_capacity += BUFFER_SIZE;
139
return buffer_capacity;
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
146
const char *pubkey, const char *tempdir){
92
ssize_t new_packet_capacity = 0;
93
ssize_t new_packet_length = 0;
94
149
gpgme_engine_info_t engine_info;
153
* Helper function to insert pub and seckey to the enigne keyring.
155
bool import_key(const char *filename){
157
gpgme_data_t pgp_data;
159
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
165
rc = gpgme_data_new_from_fd(&pgp_data, fd);
166
if (rc != GPG_ERR_NO_ERROR){
167
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
168
gpgme_strsource(rc), gpgme_strerror(rc));
172
rc = gpgme_op_import(mc->ctx, pgp_data);
173
if (rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
179
ret = TEMP_FAILURE_RETRY(close(fd));
183
gpgme_data_release(pgp_data);
97
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
188
fprintf(stderr, "Initialize gpgme\n");
139
264
if (rc != GPG_ERR_NO_ERROR){
140
265
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
141
266
gpgme_strsource(rc), gpgme_strerror(rc));
145
/* Create new GPGME "context" */
146
rc = gpgme_new(&ctx);
147
if (rc != GPG_ERR_NO_ERROR){
148
fprintf(stderr, "bad gpgme_new: %s: %s\n",
149
gpgme_strsource(rc), gpgme_strerror(rc));
153
/* Decrypt data from the FILE pointer to the plaintext data
155
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
267
gpgme_data_release(dh_crypto);
271
/* Decrypt data from the cryptotext data buffer to the plaintext
273
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
156
274
if (rc != GPG_ERR_NO_ERROR){
157
275
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
158
276
gpgme_strsource(rc), gpgme_strerror(rc));
277
plaintext_length = -1;
279
gpgme_decrypt_result_t result;
280
result = gpgme_op_decrypt_result(mc->ctx);
282
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
284
fprintf(stderr, "Unsupported algorithm: %s\n",
285
result->unsupported_algorithm);
286
fprintf(stderr, "Wrong key usage: %u\n",
287
result->wrong_key_usage);
288
if(result->file_name != NULL){
289
fprintf(stderr, "File name: %s\n", result->file_name);
291
gpgme_recipient_t recipient;
292
recipient = result->recipients;
294
while(recipient != NULL){
295
fprintf(stderr, "Public key algorithm: %s\n",
296
gpgme_pubkey_algo_name(recipient->pubkey_algo));
297
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
298
fprintf(stderr, "Secret key available: %s\n",
299
recipient->status == GPG_ERR_NO_SECKEY
301
recipient = recipient->next;
163
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
167
gpgme_decrypt_result_t result;
168
result = gpgme_op_decrypt_result(ctx);
170
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
172
fprintf(stderr, "Unsupported algorithm: %s\n",
173
result->unsupported_algorithm);
174
fprintf(stderr, "Wrong key usage: %d\n",
175
result->wrong_key_usage);
176
if(result->file_name != NULL){
177
fprintf(stderr, "File name: %s\n", result->file_name);
179
gpgme_recipient_t recipient;
180
recipient = result->recipients;
182
while(recipient != NULL){
183
fprintf(stderr, "Public key algorithm: %s\n",
184
gpgme_pubkey_algo_name(recipient->pubkey_algo));
185
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
186
fprintf(stderr, "Secret key available: %s\n",
187
recipient->status == GPG_ERR_NO_SECKEY
189
recipient = recipient->next;
195
/* Delete the GPGME FILE pointer cryptotext data buffer */
196
gpgme_data_release(dh_crypto);
310
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
198
313
/* Seek back to the beginning of the GPGME plaintext data buffer */
199
314
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
200
perror("pgpme_data_seek");
315
perror("gpgme_data_seek");
316
plaintext_length = -1;
205
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
206
*new_packet = realloc(*new_packet,
207
(unsigned int)new_packet_capacity
209
if (*new_packet == NULL){
213
new_packet_capacity += BUFFER_SIZE;
322
plaintext_capacity = adjustbuffer(plaintext,
323
(size_t)plaintext_length,
325
if (plaintext_capacity == 0){
326
perror("adjustbuffer");
327
plaintext_length = -1;
216
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
331
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
218
333
/* Print the data, if any */
223
339
perror("gpgme_data_read");
226
new_packet_length += ret;
229
/* FIXME: check characters before printing to screen so to not print
230
terminal control characters */
232
/* fprintf(stderr, "decrypted password is: "); */
233
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
234
/* fprintf(stderr, "\n"); */
340
plaintext_length = -1;
343
plaintext_length += ret;
347
fprintf(stderr, "Decrypted password is: ");
348
for(ssize_t i = 0; i < plaintext_length; i++){
349
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
351
fprintf(stderr, "\n");
356
/* Delete the GPGME cryptotext data buffer */
357
gpgme_data_release(dh_crypto);
237
359
/* Delete the GPGME plaintext data buffer */
238
360
gpgme_data_release(dh_plain);
239
return new_packet_length;
361
return plaintext_length;
242
364
static const char * safer_gnutls_strerror (int value) {
243
const char *ret = gnutls_strerror (value);
365
const char *ret = gnutls_strerror (value); /* Spurious warning */
245
367
ret = "(unknown)";
371
/* GnuTLS log function callback */
249
372
static void debuggnutls(__attribute__((unused)) int level,
250
373
const char* string){
251
fprintf(stderr, "%s", string);
374
fprintf(stderr, "GnuTLS: %s", string);
254
static int initgnutls(encrypted_session *es){
377
static int init_gnutls_global(mandos_context *mc,
378
const char *pubkeyfilename,
379
const char *seckeyfilename){
259
383
fprintf(stderr, "Initializing GnuTLS\n");
262
if ((ret = gnutls_global_init ())
263
!= GNUTLS_E_SUCCESS) {
264
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
386
ret = gnutls_global_init();
387
if (ret != GNUTLS_E_SUCCESS) {
388
fprintf (stderr, "GnuTLS global_init: %s\n",
389
safer_gnutls_strerror(ret));
394
/* "Use a log level over 10 to enable all debugging options."
269
397
gnutls_global_set_log_level(11);
270
398
gnutls_global_set_log_function(debuggnutls);
273
/* openpgp credentials */
274
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
275
!= GNUTLS_E_SUCCESS) {
276
fprintf (stderr, "memory error: %s\n",
401
/* OpenPGP credentials */
402
gnutls_certificate_allocate_credentials(&mc->cred);
403
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
277
406
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
282
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
283
" and keyfile %s as GnuTLS credentials\n", certfile,
412
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
413
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
287
417
ret = gnutls_certificate_set_openpgp_key_file
288
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
418
(mc->cred, pubkeyfilename, seckeyfilename,
419
GNUTLS_OPENPGP_FMT_BASE64);
289
420
if (ret != GNUTLS_E_SUCCESS) {
291
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
293
ret, certfile, certkey);
294
fprintf(stdout, "The Error is: %s\n",
422
"Error[%d] while reading the OpenPGP key pair ('%s',"
423
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
424
fprintf(stderr, "The GnuTLS error is: %s\n",
295
425
safer_gnutls_strerror(ret));
299
//GnuTLS server initialization
300
if ((ret = gnutls_dh_params_init (&es->dh_params))
301
!= GNUTLS_E_SUCCESS) {
302
fprintf (stderr, "Error in dh parameter initialization: %s\n",
303
safer_gnutls_strerror(ret));
307
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
308
!= GNUTLS_E_SUCCESS) {
309
fprintf (stderr, "Error in prime generation: %s\n",
310
safer_gnutls_strerror(ret));
314
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
316
// GnuTLS session creation
317
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
318
!= GNUTLS_E_SUCCESS){
429
/* GnuTLS server initialization */
430
ret = gnutls_dh_params_init(&mc->dh_params);
431
if (ret != GNUTLS_E_SUCCESS) {
432
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
433
" %s\n", safer_gnutls_strerror(ret));
436
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
437
if (ret != GNUTLS_E_SUCCESS) {
438
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
439
safer_gnutls_strerror(ret));
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
449
gnutls_certificate_free_credentials(mc->cred);
450
gnutls_global_deinit();
451
gnutls_dh_params_deinit(mc->dh_params);
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
458
/* GnuTLS session creation */
459
ret = gnutls_init(session, GNUTLS_SERVER);
460
if (ret != GNUTLS_E_SUCCESS){
319
461
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
320
462
safer_gnutls_strerror(ret));
323
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
324
!= GNUTLS_E_SUCCESS) {
325
fprintf(stderr, "Syntax error at: %s\n", err);
326
fprintf(stderr, "GnuTLS error: %s\n",
327
safer_gnutls_strerror(ret));
467
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
468
if (ret != GNUTLS_E_SUCCESS) {
469
fprintf(stderr, "Syntax error at: %s\n", err);
470
fprintf(stderr, "GnuTLS error: %s\n",
471
safer_gnutls_strerror(ret));
472
gnutls_deinit (*session);
331
if ((ret = gnutls_credentials_set
332
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
333
!= GNUTLS_E_SUCCESS) {
334
fprintf(stderr, "Error setting a credentials set: %s\n",
477
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
479
if (ret != GNUTLS_E_SUCCESS) {
480
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
335
481
safer_gnutls_strerror(ret));
482
gnutls_deinit (*session);
339
486
/* ignore client certificate if any. */
340
gnutls_certificate_server_set_request (es->session,
487
gnutls_certificate_server_set_request (*session,
341
488
GNUTLS_CERT_IGNORE);
343
gnutls_dh_set_prime_bits (es->session, DH_BITS);
490
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
495
/* Avahi log function callback */
348
496
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
349
497
__attribute__((unused)) const char *txt){}
499
/* Called when a Mandos server is found */
351
500
static int start_mandos_communication(const char *ip, uint16_t port,
352
AvahiIfIndex if_index){
501
AvahiIfIndex if_index,
354
struct sockaddr_in6 to;
355
encrypted_session es;
504
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
356
505
char *buffer = NULL;
357
506
char *decrypted_buffer;
358
507
size_t buffer_length = 0;
359
508
size_t buffer_capacity = 0;
360
509
ssize_t decrypted_buffer_size;
363
512
char interface[IF_NAMESIZE];
513
gnutls_session_t session;
515
ret = init_gnutls_session (mc, &session);
366
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
521
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
370
525
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
376
if(if_indextoname((unsigned int)if_index, interface) == NULL){
532
if(if_indextoname((unsigned int)if_index, interface) == NULL){
378
533
perror("if_indextoname");
384
536
fprintf(stderr, "Binding to interface %s\n", interface);
387
memset(&to,0,sizeof(to)); /* Spurious warning */
388
to.sin6_family = AF_INET6;
389
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
539
memset(&to, 0, sizeof(to));
540
to.in6.sin6_family = AF_INET6;
541
/* It would be nice to have a way to detect if we were passed an
542
IPv4 address here. Now we assume an IPv6 address. */
543
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
391
545
perror("inet_pton");
395
549
fprintf(stderr, "Bad address: %s\n", ip);
398
to.sin6_port = htons(port); /* Spurious warning */
552
to.in6.sin6_port = htons(port); /* Spurious warning */
400
to.sin6_scope_id = (uint32_t)if_index;
554
to.in6.sin6_scope_id = (uint32_t)if_index;
403
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
404
/* char addrstr[INET6_ADDRSTRLEN]; */
405
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
406
/* sizeof(addrstr)) == NULL){ */
407
/* perror("inet_ntop"); */
409
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
410
/* addrstr, ntohs(to.sin6_port)); */
557
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
559
char addrstr[INET6_ADDRSTRLEN] = "";
560
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
561
sizeof(addrstr)) == NULL){
564
if(strcmp(addrstr, ip) != 0){
565
fprintf(stderr, "Canonical address form: %s\n", addrstr);
414
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
570
ret = connect(tcp_sd, &to.in, sizeof(to));
416
572
perror("connect");
420
ret = initgnutls (&es);
576
const char *out = mandos_protocol_version;
579
size_t out_size = strlen(out);
580
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
581
out_size - written));
587
written += (size_t)ret;
588
if(written < out_size){
591
if (out == mandos_protocol_version){
426
gnutls_transport_set_ptr (es.session,
427
(gnutls_transport_ptr_t) tcp_sd);
430
601
fprintf(stderr, "Establishing TLS session with %s\n", ip);
433
ret = gnutls_handshake (es.session);
604
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
607
ret = gnutls_handshake (session);
608
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
435
610
if (ret != GNUTLS_E_SUCCESS){
437
fprintf(stderr, "\n*** Handshake failed ***\n");
612
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
438
613
gnutls_perror (ret);
444
//Retrieve OpenPGP packet that contains the wanted password
619
/* Read OpenPGP packet that contains the wanted password */
447
622
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
452
if (buffer_length + BUFFER_SIZE > buffer_capacity){
453
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
458
buffer_capacity += BUFFER_SIZE;
627
buffer_capacity = adjustbuffer(&buffer, buffer_length,
629
if (buffer_capacity == 0){
630
perror("adjustbuffer");
461
ret = gnutls_record_recv
462
(es.session, buffer+buffer_length, BUFFER_SIZE);
635
ret = gnutls_record_recv(session, buffer+buffer_length,
567
744
char ip[AVAHI_ADDRESS_STR_MAX];
568
745
avahi_address_snprint(ip, sizeof(ip), address);
570
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
571
" port %d\n", name, host_name, ip, port);
747
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
748
PRIu16 ") on port %d\n", name, host_name, ip,
573
int ret = start_mandos_communication(ip, port, interface);
751
int ret = start_mandos_communication(ip, port, interface, mc);
753
avahi_simple_poll_quit(mc->simple_poll);
579
757
avahi_s_service_resolver_free(r);
582
static void browse_callback(
583
AvahiSServiceBrowser *b,
584
AvahiIfIndex interface,
585
AvahiProtocol protocol,
586
AvahiBrowserEvent event,
590
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
593
AvahiServer *s = userdata;
594
assert(b); /* Spurious warning */
596
/* Called whenever a new services becomes available on the LAN or
597
is removed from the LAN */
601
case AVAHI_BROWSER_FAILURE:
603
fprintf(stderr, "(Browser) %s\n",
604
avahi_strerror(avahi_server_errno(server)));
605
avahi_simple_poll_quit(simple_poll);
608
case AVAHI_BROWSER_NEW:
609
/* We ignore the returned resolver object. In the callback
610
function we free it. If the server is terminated before
611
the callback function is called the server will free
612
the resolver for us. */
614
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
616
AVAHI_PROTO_INET6, 0,
617
resolve_callback, s)))
618
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
619
avahi_strerror(avahi_server_errno(s)));
622
case AVAHI_BROWSER_REMOVE:
625
case AVAHI_BROWSER_ALL_FOR_NOW:
626
case AVAHI_BROWSER_CACHE_EXHAUSTED:
760
static void browse_callback( AvahiSServiceBrowser *b,
761
AvahiIfIndex interface,
762
AvahiProtocol protocol,
763
AvahiBrowserEvent event,
767
AVAHI_GCC_UNUSED AvahiLookupResultFlags
770
mandos_context *mc = userdata;
773
/* Called whenever a new services becomes available on the LAN or
774
is removed from the LAN */
778
case AVAHI_BROWSER_FAILURE:
780
fprintf(stderr, "(Avahi browser) %s\n",
781
avahi_strerror(avahi_server_errno(mc->server)));
782
avahi_simple_poll_quit(mc->simple_poll);
785
case AVAHI_BROWSER_NEW:
786
/* We ignore the returned Avahi resolver object. In the callback
787
function we free it. If the Avahi server is terminated before
788
the callback function is called the Avahi server will free the
791
if (!(avahi_s_service_resolver_new(mc->server, interface,
792
protocol, name, type, domain,
793
AVAHI_PROTO_INET6, 0,
794
resolve_callback, mc)))
795
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
796
name, avahi_strerror(avahi_server_errno(mc->server)));
799
case AVAHI_BROWSER_REMOVE:
802
case AVAHI_BROWSER_ALL_FOR_NOW:
803
case AVAHI_BROWSER_CACHE_EXHAUSTED:
805
fprintf(stderr, "No Mandos server found, still searching...\n");
631
/* Combines file name and path and returns the malloced new
632
string. some sane checks could/should be added */
633
static const char *combinepath(const char *first, const char *second){
634
size_t f_len = strlen(first);
635
size_t s_len = strlen(second);
636
char *tmp = malloc(f_len + s_len + 2);
641
memcpy(tmp, first, f_len);
645
memcpy(tmp + f_len + 1, second, s_len);
647
tmp[f_len + 1 + s_len] = '\0';
652
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
653
AvahiServerConfig config;
811
int main(int argc, char *argv[]){
654
812
AvahiSServiceBrowser *sb = NULL;
657
int returncode = EXIT_SUCCESS;
658
const char *interface = NULL;
815
int exitcode = EXIT_SUCCESS;
816
const char *interface = "eth0";
817
struct ifreq network;
821
char *connect_to = NULL;
822
char tempdir[] = "/tmp/mandosXXXXXX";
659
823
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
660
char *connect_to = NULL;
663
static struct option long_options[] = {
664
{"debug", no_argument, (int *)&debug, 1},
665
{"connect", required_argument, 0, 'C'},
666
{"interface", required_argument, 0, 'i'},
667
{"certdir", required_argument, 0, 'd'},
668
{"certkey", required_argument, 0, 'c'},
669
{"certfile", required_argument, 0, 'k'},
672
int option_index = 0;
673
ret = getopt_long (argc, argv, "i:", long_options,
703
certfile = combinepath(certdir, certfile);
704
if (certfile == NULL){
705
perror("combinepath");
709
if(interface != NULL){
710
if_index = (AvahiIfIndex) if_nametoindex(interface);
712
fprintf(stderr, "No such interface: \"%s\"\n", interface);
824
const char *seckey = PATHDIR "/" SECKEY;
825
const char *pubkey = PATHDIR "/" PUBKEY;
827
mandos_context mc = { .simple_poll = NULL, .server = NULL,
828
.dh_bits = 1024, .priority = "SECURE256"
829
":!CTYPE-X.509:+CTYPE-OPENPGP" };
830
bool gnutls_initalized = false;
831
bool gpgme_initalized = false;
834
struct argp_option options[] = {
835
{ .name = "debug", .key = 128,
836
.doc = "Debug mode", .group = 3 },
837
{ .name = "connect", .key = 'c',
838
.arg = "ADDRESS:PORT",
839
.doc = "Connect directly to a specific Mandos server",
841
{ .name = "interface", .key = 'i',
843
.doc = "Interface that will be used to search for Mandos"
846
{ .name = "seckey", .key = 's',
848
.doc = "OpenPGP secret key file base name",
850
{ .name = "pubkey", .key = 'p',
852
.doc = "OpenPGP public key file base name",
854
{ .name = "dh-bits", .key = 129,
856
.doc = "Bit length of the prime number used in the"
857
" Diffie-Hellman key exchange",
859
{ .name = "priority", .key = 130,
861
.doc = "GnuTLS priority string for the TLS handshake",
866
error_t parse_opt (int key, char *arg,
867
struct argp_state *state) {
868
/* Get the INPUT argument from `argp_parse', which we know is
869
a pointer to our plugin list pointer. */
871
case 128: /* --debug */
874
case 'c': /* --connect */
877
case 'i': /* --interface */
880
case 's': /* --seckey */
883
case 'p': /* --pubkey */
886
case 129: /* --dh-bits */
888
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
894
case 130: /* --priority */
902
return ARGP_ERR_UNKNOWN;
907
struct argp argp = { .options = options, .parser = parse_opt,
909
.doc = "Mandos client -- Get and decrypt"
910
" passwords from a Mandos server" };
911
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
912
if (ret == ARGP_ERR_UNKNOWN){
913
fprintf(stderr, "Unknown error while parsing arguments\n");
914
exitcode = EXIT_FAILURE;
919
/* If the interface is down, bring it up */
921
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
924
exitcode = EXIT_FAILURE;
927
strcpy(network.ifr_name, interface);
928
ret = ioctl(sd, SIOCGIFFLAGS, &network);
930
perror("ioctl SIOCGIFFLAGS");
931
exitcode = EXIT_FAILURE;
934
if((network.ifr_flags & IFF_UP) == 0){
935
network.ifr_flags |= IFF_UP;
936
ret = ioctl(sd, SIOCSIFFLAGS, &network);
938
perror("ioctl SIOCSIFFLAGS");
939
exitcode = EXIT_FAILURE;
943
ret = TEMP_FAILURE_RETRY(close(sd));
962
ret = init_gnutls_global(&mc, pubkey, seckey);
964
fprintf(stderr, "init_gnutls_global failed\n");
965
exitcode = EXIT_FAILURE;
968
gnutls_initalized = true;
971
if(mkdtemp(tempdir) == NULL){
977
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
978
fprintf(stderr, "gpgme_initalized failed\n");
979
exitcode = EXIT_FAILURE;
982
gpgme_initalized = true;
985
if_index = (AvahiIfIndex) if_nametoindex(interface);
987
fprintf(stderr, "No such interface: \"%s\"\n", interface);
717
991
if(connect_to != NULL){
720
994
char *address = strrchr(connect_to, ':');
721
995
if(address == NULL){
722
996
fprintf(stderr, "No colon in address\n");
997
exitcode = EXIT_FAILURE;
726
1001
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
728
1003
perror("Bad port number");
1004
exitcode = EXIT_FAILURE;
731
1007
*address = '\0';
732
1008
address = connect_to;
733
ret = start_mandos_communication(address, port, if_index);
1009
ret = start_mandos_communication(address, port, if_index, &mc);
1011
exitcode = EXIT_FAILURE;
1013
exitcode = EXIT_SUCCESS;
741
certkey = combinepath(certdir, certkey);
742
if (certkey == NULL){
743
perror("combinepath");
748
1019
avahi_set_log_function(empty_log);
751
/* Initialize the psuedo-RNG */
1022
/* Initialize the pseudo-RNG for Avahi */
752
1023
srand((unsigned int) time(NULL));
754
/* Allocate main loop object */
755
if (!(simple_poll = avahi_simple_poll_new())) {
756
fprintf(stderr, "Failed to create simple poll object.\n");
761
/* Do not publish any local records */
762
avahi_server_config_init(&config);
763
config.publish_hinfo = 0;
764
config.publish_addresses = 0;
765
config.publish_workstation = 0;
766
config.publish_domain = 0;
768
/* Allocate a new server */
769
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
770
&config, NULL, NULL, &error);
772
/* Free the configuration data */
773
avahi_server_config_free(&config);
775
/* Check if creating the server object succeeded */
777
fprintf(stderr, "Failed to create server: %s\n",
1025
/* Allocate main Avahi loop object */
1026
mc.simple_poll = avahi_simple_poll_new();
1027
if (mc.simple_poll == NULL) {
1028
fprintf(stderr, "Avahi: Failed to create simple poll"
1030
exitcode = EXIT_FAILURE;
1035
AvahiServerConfig config;
1036
/* Do not publish any local Zeroconf records */
1037
avahi_server_config_init(&config);
1038
config.publish_hinfo = 0;
1039
config.publish_addresses = 0;
1040
config.publish_workstation = 0;
1041
config.publish_domain = 0;
1043
/* Allocate a new server */
1044
mc.server = avahi_server_new(avahi_simple_poll_get
1045
(mc.simple_poll), &config, NULL,
1048
/* Free the Avahi configuration data */
1049
avahi_server_config_free(&config);
1052
/* Check if creating the Avahi server object succeeded */
1053
if (mc.server == NULL) {
1054
fprintf(stderr, "Failed to create Avahi server: %s\n",
778
1055
avahi_strerror(error));
779
returncode = EXIT_FAILURE;
1056
exitcode = EXIT_FAILURE;
783
/* Create the service browser */
784
sb = avahi_s_service_browser_new(server, if_index,
1060
/* Create the Avahi service browser */
1061
sb = avahi_s_service_browser_new(mc.server, if_index,
785
1062
AVAHI_PROTO_INET6,
786
1063
"_mandos._tcp", NULL, 0,
787
browse_callback, server);
1064
browse_callback, &mc);
789
1066
fprintf(stderr, "Failed to create service browser: %s\n",
790
avahi_strerror(avahi_server_errno(server)));
791
returncode = EXIT_FAILURE;
1067
avahi_strerror(avahi_server_errno(mc.server)));
1068
exitcode = EXIT_FAILURE;
795
1072
/* Run the main loop */
798
fprintf(stderr, "Starting avahi loop search\n");
1075
fprintf(stderr, "Starting Avahi loop search\n");
801
avahi_simple_poll_loop(simple_poll);
1078
avahi_simple_poll_loop(mc.simple_poll);
806
1083
fprintf(stderr, "%s exiting\n", argv[0]);
809
1086
/* Cleanup things */
811
1088
avahi_s_service_browser_free(sb);
814
avahi_server_free(server);
817
avahi_simple_poll_free(simple_poll);
1090
if (mc.server != NULL)
1091
avahi_server_free(mc.server);
1093
if (mc.simple_poll != NULL)
1094
avahi_simple_poll_free(mc.simple_poll);
1096
if (gnutls_initalized){
1097
gnutls_certificate_free_credentials(mc.cred);
1098
gnutls_global_deinit ();
1099
gnutls_dh_params_deinit(mc.dh_params);
1102
if(gpgme_initalized){
1103
gpgme_release(mc.ctx);
1106
/* Removes the temp directory used by GPGME */
1107
if(tempdir[0] != '\0'){
1109
struct dirent *direntry;
1110
d = opendir(tempdir);
1115
direntry = readdir(d);
1116
if(direntry == NULL){
1119
if (direntry->d_type == DT_REG){
1120
char *fullname = NULL;
1121
ret = asprintf(&fullname, "%s/%s", tempdir,
1127
ret = unlink(fullname);
1129
fprintf(stderr, "unlink(\"%s\"): %s",
1130
fullname, strerror(errno));
1137
ret = rmdir(tempdir);